Carbureter.



J. B. FUNK. CARBURETER. APPLICATION FILED mm. 191s.

Patented Apr. 3, 1917 WTNESSES:

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Be it known vthat l, 'JAMES B. FUNK, a citizen of the United States, residing at 1ndianapols, in the county of Marion and State of Indiana, have invented a new and useful Carburetor, of which the following is a specication.

fuel-control needle and the vautomatic air valve in alinement, so that opening of the air valve by the engine suction may act to open the fuel valve correspondingly by a simple pushrod connection between the two,

and l make' the needle and air valve so that they open by movements in the same direction along the same line; and I provide a lateral outlet forthe mixture from a point between the fuel and air valves, and supply the primary-air and f uel and the secondary air in opposite directions to this intermediate point, so that they collide to cause a considerable turbulence which .results in an intimate mixture of the fuel and air. l also provide an adjustment between the fuel needle and the automatic air valve, whereby the opening of one for a given opening ofthe other may be varied.

The single -ligure ofthe accompanying drawing is a central vertical section through a carbureter embodying my invention.

The main body 10 of the carbureter has a depending tube 11 which discharges upwardly through a sheet metal Venturi tube 12 into a mixing chamber 13 from which there is a lateral outlet tube 14 provided.K

with a butterfly throttle valve 15. A gasolene bowl 16 surrounds the tube 11, and is provided with the usual iloat 17 and ioatoperated inlet valve 18 for maintaining substantially constant the gasolene level in the bowl. The gasolene, or other fuel, is supplied rom the bowl 16 through openings 19 to the hollow central boss 20, in which is screwed a vertically extending nozzle tube 21 having a vertical hole throughout its length and lateral discharge openings 22 at Specification of Lettera Patent. application tiled January 5, 1916. Serial No. 70,382.

ln carrying out my invention, l place the Patented iapr.. .3, 121'?.

the contracted portion of the Venturi tube 12. A long-taper conical valve 23 having its small end upward is mounted in the vertical hole in the nozzle tube 21, and coperates with the walls of the hole below the discharge o enings 22 to control the amount vof fuel discliar ed. This valve 23 is springpressed upwar by a compression spring 24 having its lower end seated in the upper part of a draining pet cock 25 screwed into the closed lower end of the tube 11. From ythe upper end of the valve 23 projects a guide stem 26, upon which rests a push rod 27, the guide stem'26 and push rod 27 having a sliding itin the vertical hole in the upper part of the fuel nozzle 23.

The upper end of the push rod 27 projects beyond the upper end of the fuel nozzle 21 and bears against the under surface of an adjustable abutment 30 carried by an automatic air valve 31 which opens downward into the mixing chamber13 and provides a variable air inlet thereinto from the air-supply passage 32,in the inlet end of which may be a control valve 33. rlhe valves 31 and 23 are in alinement, and both open by downward movement. A by-pass 34 connects the inlet passage 32 to the upper end of the tube 11, so that if for any reason special air is desired, such as heated air for instance, itlmay be supplied from a single source both for the primary air which passes up from the Venturi tube 12 and the secondary air which is controlled by the auxiliary air valve 31.

The particular construction and mounting of the auxiliary air valve, and the particular form of adjusting means for the abutment 30, are the invention of Earl A. Bessom, and are claimed specifically in his application Ser. No. 70,350, iiled January 5, 1916, but l have used them for illustration herein as they comprise the best embodiment of my generic invention, so far as l now know. rlhe valve 31 is ixed on the lower end of a tube 40, on the upper end of which is xed a dash ot piston 41 which is vertically slidable in a dash pot cylinder 42 formed in the wall 43 of the cap piece which fits on the main body member 10 and has formed within it the air inlet passage 32 and the valve seat 44 for the auxiliary air valve 31. The valve 31 and piston 41 are springpressed upward by a compression spring 45 los which surrounds the tube 40 and acts between the .piston 41 and a sheet metal shell .46 which is held in place by inwardly-pron jecting screws 47. The valve 31 and tube 40 upwardly extending flat tongue 49 which has a sliding fit in a vertical fiat notch 50 in the lower end of a vertical rod 51 having a knurled operating head 52Uat its upper end and outside the -wall 43. The rod 51 is mounted in a tube 53, which has a sliding -fit within and serves as a gliide for the tube 40. The tube 53 is suitably held rigidly in place, as by Soldering; and the rod 51 is held v ertically in place by a spring-pressed ball 54 which is spring-pressed through a hole in the tube 53 into a circumferential notch 55 in the rod 51 near its upper end. By turning the knurled 'head 52, the rod 51 and abutment 30 are also turned, but since the tube 40 and valve 31 are prevented from turning by l the pin 48 this turning of the abutment 30 causes it to travel along its screw-threaded mounting in the lower end of the .tube and thereby varies the vertical height of the under surface of such abutment relatively to the valve 31. This adjustment provides for a relative adjustment between the auxiliary air valve 31 and the fuel valve 23, thus providing for different fuel valve openings for a given auxiliary air valve opening.

In operation, air is drawn past the valve 33 into the inlet passage 32, whence someof it passes through the by-pass 34 into the tube 11 and up through the Venturi tube 12 past the fuel discharge openings 22, pick- -ing up fuel as it passes, this mixture of primary air and fuel being discharged upwardly into the mixing chamber 13. The remainder of the air drawn into the inlet passage 32 passes by the auxiliary air valve 31, the amount of such remainder depending upon the opening of such auxiliary air valve,

' and thusenters downwardly into the mixing chamber 13. Thus the auxiliary air passin downwardly into the mixing chamber 13 co lides violently with the mixture of mary' air and fuel entering upwardly mto such mixing chamber, producing a very considerable turbulence. This turbulence causes an intimate mixing of the fuel andair, and this intimate mixture is discharged through the lateral outlet 14, past the throttle valve 15, and into the inlet manifold of the associated engine, which manifold is connected in any suitable manner with the outlet 14. As the vacuum in the carbureter varies, the

auxiliary ai'r valve 31 `is drawn down or allowed to rise, and by reason of the push rod 27 yand valve stem 26 causes a similar the size of the fuel supply opening for al given auxiliary air supply opemng.

Mounted on the reduced upper end of the fuel nozzle 21 is a sliding tubular member or choker 60, which is drawn upward by the How of primaryl air as the vacuum inV the carbureter increases. The upward and downward movement of this member 60 controls the effective size of the Venturi tube 12, so as to control the iiow of primary air through such Venturitube, and to reduce the amount of primary air and enrich the mixo ture when the vacuum in the carbureter is light, as when the engine is idling. However, ,this sliding member 60 is not my invention. 4

AI claim as my invention:

1. In a carbureter, the combination of a mixing chamber, a primary air and fuel supply passage leading into said mixing chamber from one direction, an auxiliary air supply passage leading into said chamo ber from the opposite direction, so that the fluids supplied from the two passages c01- lide to produce a turbulence, a lateral outlet passage from such mixing chamber, an

automatic valve controlling the How of air through said auxiliary air inlet passage and opening toward said mixing chamber, a fuel valve controlling the supply of fuel to said primary air and fuel supply passage and .opening by movement away from said mixing chamber, and a push rod 'projecting from one of said valves to the other .so that the opening of the auxiliary air valve produces a corresponding opening of 'the fuel valve, said auxiliary air valve being provided with an adjustable abutment against which said push rod bears,to permit a relative adjustment of the positions of the two valves.

2. In-a carbureter, the combination of-a mixing chamber, a Venturi 'tube discharging upwardly into said mixing chamber, a fuel nozzle discharging within said Venturi tube, said Venturi tube being open at the bottom to receive a supply of primary air, said mixing chamber being provided at its upper end with a secondary air inlet opening through which secondary airis admitted downwardly into said mixing chamber so as to collide with said primary air and fuel discharged upwardly into said chamber from the Venturi tube, said mixing chamber also belng provided with a lateral outlet opening, a downwardly opening automatic auxiliary air valve in said auxiliary air inlet openmg, a downwardly opening fuel valve in said fuel nozzle, said two valves being in alinement, and a push rod projecting upwardly from said fuel valve and bearing against 'an abutment on said auxiliary air Valve so ythat downward movement of the auxiliary air Valve produces a corresponding downward movement of said fuel valve,

said abutment being adjustable relatively to said auxiliary air valve. i

In witness whereof, I have hereun'to set w my hand lat Indianapolis, Indiana, this twenty-eighth day of December, A. D. one thousand'nine hundred and fifteen.

JAMES B. FUNK. 

